LaboratoryInstitute
Official Merchandise
GUILD Institute of Gemology
GUILD Gem Testing Kit
A curated set of professional-grade gemological instruments for field identification, classroom instruction, and everyday gem trade use.
Field-readyLaboratory-informedFour decades of practice
GUILD Editorial
The Handbook of Field Gemology
A mine-to-market field gemology guide by Andrew Lucas, integrating global field expeditions, sourcing strategy, and supply chain insight for modern gemstone professionals.
2026 Updated Edition
More Coming
More products are on the way — apparel, instruments, and reference materials curated for gemological education and professional practice.